Which Training technique?

For a plant growing outside there is no reason for training. The only thing you need to do is put her in a spot where she get as much (direct) sunlight as possible. And feed her the necessary nutrients for every phase. A grow nutrient with enough nitrogen (N) during the grow phase. And a blooming nutrients with enough phosphorus (P) and potassium (K) during flowering. When the buds start to swell (2-3 weeks after you notice the first white hairs) you can add a PK-Booster like PK 13/14 The plant is using the phosphorus (P) and potassium (K) to make the buds. Training plants is really for indoor growing where you want the light (that is stuck and only shines from 1 direction) to reach all the parts of the plants and buds equally. Nature did her work to catch as much sunlight and for that be as efficient as possible for cannabis outside. Her shape is made (by nature) to catch as much sunlight as possible. People might tell you to do LST or defolliation. But really when this would have been the way to go mother nature would have done this with cannabis over the many thousands years of evolution. Growing inside is a whole different story because you do not work with the elements. You try to fake them as good as possible. But will never be as good as mother nature herself! Let the plant do her thing and enjoy the show!